【摘要】 通过粉末冶金技术制备60Al–30Fe–10Bi合金药型罩材料,采用分离式霍普金森（Hopkinson）压杆测试了铝基合金在变形温度从25⁴50℃和应变速率从1300⁷000 s^-1下的动态冲击压缩力学性能,研究了其动态变形前后微观组织的演变规律和断裂机制。结果表明:60Al–30Fe–10Bi合金在动态冲击压缩下的流变应力主要依赖于温度的变化,流变应力随变形温度的升高而降低,而应变速率对流变应力的影响不大;合金在25℃、1300 s^-1下的高速冲击载荷作用下的失效原因是发生了绝热剪切。更多还原

【Abstract】 The dynamic impact compression experiments of 60 Al–30 Fe–10 Bi alloy liner material prepared by powder metallurgy were carried out on the split Hopkinson pressure bar, the dynamic impact compressive mechanical properties of the alloy were investigated in the deformation temperature range from 25 ℃ to 450 ℃ and the strain rate range from 1300 s^-1 to 7000 s^-1 under dynamic impact compression test, the microstructure evolution and fracture mechanism of the alloy before and after the dynamic deformation were investigated. The results show that, the flow stress of 60 Al–30 Fe–10 Bi alloy is dominated by temperature, and it decreases with the increase of deformation temperature, and the strain rate has little effect on it. It is determined that the tested material fails under high impact load as a result of adiabatic shearing at 25 ℃ and 1300 s^-1.更多还原